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What are the causes if coolant found in combustion air

Here are possible causes for the presence of moisture in the combustion air: 

1. Atmospheric Humidity: Atmospheric moisture can naturally enter the intake system, especially in humid or rainy conditions.

2. Condensation: During cold weather, the intake system can cool down, causing moisture in the air to condense and accumulate. 

3. Faulty Air Intake Seals: Worn or damaged seals in the air intake system can allow external moisture to enter the system. 

4. Improper Air Filter Sealing: A poorly sealed or wet air filter can introduce moisture into the intake air. 

5. Drainage Issues: Accumulated water or condensation within the air intake components can enter the combustion air. 

6. Coolant Leaks: Coolant leaks near the air intake system can result in moisture entering the combustion air. 

7. Exhaust Gas Recirculation (EGR) System Issues: If the EGR system malfunctions, it can introduce moisture from exhaust gases into the combustion air. 

8. Turbocharger Intercooler Problems: A malfunctioning intercooler can lead to moisture buildup in the combustion air.

9. Faulty Breather System: Issues with the crankcase breather system can lead to moisture entering the combustion air.

10. Inadequate Airflow: Slow-moving or stagnant air within the intake system can cause moisture to condense and accumulate. 

11. Cooling System Leaks: Leaks in the cooling system can release coolant vapor, which can mix with the combustion air.

12. Cold Start Conditions: During cold starts, moisture in the air can condense on the intake components.


The presence of moisture in the combustion air can lead to decreased engine efficiency, increased emissions, and potential damage to engine components. It's important to address this issue to ensure proper combustion and engine performance. Taking steps to prevent moisture accumulation, such as maintaining seals and addressing leaks, is essential. If the issue persists and impacts engine performance, consulting a professional mechanic is recommended to diagnose the specific cause and implement necessary repairs or maintenance.


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